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On the Real Part of Butterfly Factorizations, with Application to Fast Transforms

Chaumette, Ma{ë}l et al.
arXiv (All) · Papers
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signal-processing
Fast transforms such as the Discrete Cosine Transform can be expressed as the real part of a product of complex-valued structured sparse matrices known as Kronecker-sparse factors. More generally, products of such structured sparse matrices appear in square dyadic butterfly and monarch matrices, whi
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